Cấu trúc:

$Verb:$

$(+)S+V(ed/V_2)+...$

$(-)S+did+not+V(inf)+...$

$(?)Did+S+V(inf)+...?$

$Tobe:$

$(+)S+tobe(was/were)+...$

$(-)S+tobe(was/were)+not+...$

$(?)Tobe(Was/Were)+S+...?$

`1.(-)` He didn't write a book.

`(?)` Did he write a book?

`2.(-)` She wasn't my boss.

`(?)` Was she your boss?

`3.(+)` They built a new house.

`(?)` Did they built a new house?

`4. (+)` I was at the concert last Sunday.

`(?)` Were you at the concert lát Sunday?

`5.(+)` I bought clothes in this little shop.

`(-)` I didn't buy clothes in this little shop.